Debgurl turned me on to the Silicone Nozzles Model B, and now there is no other nozzle for me. I have to thank you again, Debgurl, for the countless enema orgasms my Model B has given me.
The Model B is intimidating, and It penetrates about 11 inches, including a few inches into the lower sigmoid colon. If you enjoy modest sized butt plugs and enemas, I know you'll love the Model B. It has two enlarged bulbs on its shaft, but the bulbs are not a huge diameter--about 2 inches I think. When I first fully insert it and my Model B pops through my inner sphincter, it instantly feels wonderful, almost orgasmic. The top bulb seats perfectly onto the inside of my inner sphincter at the bottom of my sigmoid colon while simultaneously the bottom bulb perfectly seats onto the inside of my anal sphincter at the bottom of my rectum. This lets me get an amazingly powerful, two-sphincter 'grip' on my Model B when I clench, squeeze and pull inward with my two sphincters and my pelvic floor muscles. I want to get a fish scale and measure the pulling force I can generate. I think it’s easily 10 pounds! It's more than enough pulling force to hold the Model B securely enough inside me to hold back a gallon enema fill that wants to blast out, even when I'm standing.
The wondrous thing about the Model B is how its orgasm-inducing pleasure goes off the scale the harder I squeeze down on it and pull it inward with my pelvic floor muscles. I love to use my Model B hands free to slowly fill myself with a series of gallon bags. As a gallon bag starts to fill me, I initially don't need to squeeze down on my Model B to hold it inside me no hands. However, during the second quart I have to start squeezing, clenching, and pulling inward, which makes my Model-B pleasure increase dramatically. The more water I'm filled with, the greater the Model B pleasure becomes because the harder I have to squeeze to hold it in. My clenching force and Model B pleasure max out at near-orgasmic levels when I've got almost a gallon inside me. So far, I haven't been able to cum just from the pleasure of the enema working with the Model B alone, but I've gotten very close a few times. When I'm close, I only need minimal stimulation with one hand near the base of my penis to send me over the edge. I like to put a palm on my pubes, scissor the base of my cock with two fingers on each side of it, and apply light, rhythmic, downward pressure with my palm and fingers. That's all it takes for me to have a mind blowing orgasm as the last of a gallon flows into me or I'm holding a gallon inside me with my two-sphincter 'grip' pulling in hard on my Model B.